Appearance of Spruce Plywood
UPM's premium WISA-Spruce grade (improved standard Grade II). Solid surface with no open defects.
The finest spruce standard grade according to EN 635-3. Repaired with filler and plugs. Unrepaired knots with a diameter of up to 5 mm are permitted.
A grade which may have open splits and knot holes according to EN635-3. Grade III offers the full technical strength of spruce plywood and it is recommended for use in applications where surface appearance is not of primary importance. Grade specification according to EN 635-5.